graph TD
    App[应用请求] --> Pool["连接池管理器<br/>MySQLPool"]
    Pool --> C1[Conn 1]
    Pool --> C2[Conn 2]
    Pool --> C3[Conn 3]
    Pool --> C4[...pool_size=10]
    
    C1 --> MySQL[(MySQL Server)]
    C2 --> MySQL
    C3 --> MySQL
    C4 --> MySQL
    
    style Pool fill:#fff4e1
    style MySQL fill:#ffe1e1
